The number of visitor arrivals to Japan in 2015 was over 19 millions, which is the highest yearly number ever recorded. Japan National Tourism Organization (JNTO) forecasts growth of the number of visitor arrivals until 2020. Recent years, a short supply in accommodations has occurred in Japan. In this paper, we forecast demand and supply for accommodations during the period of Tokyo 2020 Olympic by using Tokyo 2020 games foundation plan and travel agent's website data. Then we estimate the demand-and-supply balance in accommodations. Moreover, we formulate mathematical programming model for 2-days ticket, and we show that introduction of a 2-days ticket is useful for improvement of demand-and-supply balance.